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Drawbar (haulage)

 

 
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Drawbar (haulage)
 
 
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A drawbar is a solid coupling
Coupling

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation, though there do exist torque limiter couplings which can slip or disconnect when some torque limit is exceeded....
 between a hauling vehicle and its hauled load. Drawbars are in common use with rail transport, road trailers, both large and small, industrial and recreational, and with agricultural equipment.

cultural equipment is hauled from a tractor mounted drawbar.






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Drawbar Trailer Coupling
A drawbar is a solid coupling
Coupling

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation, though there do exist torque limiter couplings which can slip or disconnect when some torque limit is exceeded....
 between a hauling vehicle and its hauled load. Drawbars are in common use with rail transport, road trailers, both large and small, industrial and recreational, and with agricultural equipment.

Agriculture

Agricultural equipment is hauled from a tractor mounted drawbar. Specialist agricultural tools such as plough
Plough

The plough is a tool used in farming for initial cultivation of soil in preparation for sowing seed or planting. It has been a basic instrument for most of recorded history, and represents one of the major advances in agriculture....
s are attached to specialist drawbars which have functions in addition to transmitting tractive force.

Road

The drawbar should not be confused with the fifth wheel coupling
Fifth wheel coupling

The fifth wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly . Some recreational vehicles RVs are in a fifth wheel configuration, requiring the coupling to be installed in the bed of a pickup truck as a towing vehicle....
. The drawbar requires a trailer which either loads the drawbar lightly (for example a small boat trailer, or caravan, where a load of up to ~50 kg is part of correct trailer loading practice), or the load is the weight of the coupling components only (larger trailers, usually but not always with a steerable hauled axle, front or rear). By contrast, the fifth wheel is designed to transmit a major proportion of the load's weight to the hauling vehicle.

Rail

A rail locomotive
Locomotive

A locomotive is a Rail transport vehicle that provides the motive power for a train. The word originates from the Latin language loco - "from a place", Ablative case of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine,....
 hauls its load through a drawbar and hauling force is transmitted between rolling stock
Rolling Stock

Rolling Stock was a newspaper of ideas and a chronicle of the 1980s published in Boulder, Colorado, Colorado by Ed Dorn and Jennifer Dunbar Dorn....
 via drawbars between units.

A drawbar is mounted or located on the tractive vehicle and is used to accept the coupling of the load. The direction of haulage may be push or pull, though pushing tends to be for a pair of ballast tractor
Ballast tractor

A ballast tractor is a haulage road vehicle designed to pull or push heavy or exceptionally large loads. Unlike the tractor unit from an Semi-trailer, the ballast tractor is designed or adapted to pull or push loads from a Drawbar ....
s working one pulling and the other pushing an exceptional load on a specialist trailer.